s390/zcrypt: make sysfs reset attribute trigger queue reset

[mirror_ubuntu-bionic-kernel.git] / drivers / s390 / crypto / ap_queue.c

diff --git a/drivers/s390/crypto/ap_queue.c b/drivers/s390/crypto/ap_queue.c
index 0aa4b3ccc948c10cbbd9ac904d6da353e341fd78..576ac08777c509ee038a50ec95a892fc79776355 100644 (file)
--- a/drivers/s390/crypto/ap_queue.c
+++ b/drivers/s390/crypto/ap_queue.c
@@ -14,6 +14,9 @@
 #include <asm/facility.h>
 
 #include "ap_bus.h"
+#include "ap_debug.h"
+
+static void __ap_flush_queue(struct ap_queue *aq);
 
 /**
  * ap_queue_enable_interruption(): Enable interruption on an AP queue.
@@ -541,7 +544,25 @@ static ssize_t reset_show(struct device *dev,
        return rc;
 }
 
-static DEVICE_ATTR_RO(reset);
+static ssize_t reset_store(struct device *dev,
+                          struct device_attribute *attr,
+                          const char *buf, size_t count)
+{
+       struct ap_queue *aq = to_ap_queue(dev);
+
+       spin_lock_bh(&aq->lock);
+       __ap_flush_queue(aq);
+       aq->state = AP_STATE_RESET_START;
+       ap_wait(ap_sm_event(aq, AP_EVENT_POLL));
+       spin_unlock_bh(&aq->lock);
+
+       AP_DBF(DBF_INFO, "reset queue=%02x.%04x triggered by user\n",
+              AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
+
+       return count;
+}
+
+static DEVICE_ATTR_RW(reset);
 
 static ssize_t interrupt_show(struct device *dev,
                              struct device_attribute *attr, char *buf)